Laurene Powell Jobs, widow of the late Steve Jobs, is the 28th wealthiest person in America, and the 4th richest woman. According to Forbes magazine's newest wealth ranking, Mrs. Powell Jobs is worth some $16.6 billion, less than the likes of Bill Gates, Warren Buffet, Sheldon Adelson, and Sergey Brin, but more than roughly 313.9 million other people.

Forbes publishes an annual list of the rich, both in the U.S. and globally. Monday's list was for Americans. Microsoft founder Bill Gates once again topped the list at $81.2 billion, well ahead of the Wizard of Omaha, Warren Buffet, who came in at $67.8 billion.

Larry Ellison was #3 at $48.1 billion, while Mark Zuckerberg was #10, at $34.8 billion. The rest of the Top 10 was a who's-who of conservatives, including both Koch brothers (the two that matter, anyway), and a handful of Walton heirs.

Google founders Larry Page and Sergey Brin were #12 and 13, respectively, with each being worth of $31 billion and enough change to buy everyone reading this article.

Brick and mortar casino billionaire Sheldon Adelson was #14 at $30.9 billion—his main claim to public fame is currently arguing that Internet gambling, which he doesn't own, is bad, while casino gambling, which he does own, is good. He's poured millions into the political campaigns of those willing to pretend that's a rational position.

Which brings us back to Mrs. Powell Jobs. According to her Forbes mini-profile, she is, "among the top donors to Ready for Hillary, a super PAC that has already raised some $6 million to support a Clinton presidential run."

She is also Disney's top investor, with 130 million shares. At Monday's closing price of $88.83 per share, that's $11.2 billion in Mickey Mouse bucks. She also owns a big chunk of Apple.

In addition to her political activities, Mrs. Powell Jobs is an angel investor, the founder and chair of the Emerson Collective, a member of College Track, and is involved in other charities and funds taking aim at improving education in the U.S.